In order to transmit the speech information safely in the channel,a new speech encryp-tion algorithm in linear canonical transform(LCT)domain based on dynamic modulation of chaot-ic system is proposed.The algorithm fi...In order to transmit the speech information safely in the channel,a new speech encryp-tion algorithm in linear canonical transform(LCT)domain based on dynamic modulation of chaot-ic system is proposed.The algorithm first uses a chaotic system to obtain the number of sampling points of the grouped encrypted signal.Then three chaotic systems are used to modulate the corres-ponding parameters of the LCT,and each group of transform parameters corresponds to a group of encrypted signals.Thus,each group of signals is transformed by LCT with different parameters.Fi-nally,chaotic encryption is performed on the LCT domain spectrum of each group of signals,to realize the overall encryption of the speech signal.The experimental results show that the proposed algorithm is extremely sensitive to the keys and has a larger key space.Compared with the original signal,the waveform and LCT domain spectrum of obtained encrypted signal are distributed more uniformly and have less correlation,which can realize the safe transmission of speech signals.展开更多
针对在实际应用过程中,变换域通信系统的发射端和接收端电磁环境不相同而导致的收发两端出现基函数不一致的情况,对一种新的CASK算法进行了仿真。根据CASK算法和CSK算法以及双极性算法不同干扰、不同噪声和不同收发不一致比例的情况下...针对在实际应用过程中,变换域通信系统的发射端和接收端电磁环境不相同而导致的收发两端出现基函数不一致的情况,对一种新的CASK算法进行了仿真。根据CASK算法和CSK算法以及双极性算法不同干扰、不同噪声和不同收发不一致比例的情况下系统误码率和理论误码率的对比研究,可以发现,虽然在理想情况下,三者差距不大,然而当收发不一致的比例逐渐上升时,CASK算法的传输性能下降较慢,可以进行正常传输,且其传输性能较双极性调制和CSK调制分别提高2 d B和1 d B,具有良好的抗不一致性能,具有良好的应用前景。展开更多
基金supported by the National Natural Science Found-ation of China(No.61901248)the Scientific and Tech-nological Innovation Programs of Higher Education Institu-tions in Shanxi(No.2019L0029).
文摘In order to transmit the speech information safely in the channel,a new speech encryp-tion algorithm in linear canonical transform(LCT)domain based on dynamic modulation of chaot-ic system is proposed.The algorithm first uses a chaotic system to obtain the number of sampling points of the grouped encrypted signal.Then three chaotic systems are used to modulate the corres-ponding parameters of the LCT,and each group of transform parameters corresponds to a group of encrypted signals.Thus,each group of signals is transformed by LCT with different parameters.Fi-nally,chaotic encryption is performed on the LCT domain spectrum of each group of signals,to realize the overall encryption of the speech signal.The experimental results show that the proposed algorithm is extremely sensitive to the keys and has a larger key space.Compared with the original signal,the waveform and LCT domain spectrum of obtained encrypted signal are distributed more uniformly and have less correlation,which can realize the safe transmission of speech signals.
文摘针对在实际应用过程中,变换域通信系统的发射端和接收端电磁环境不相同而导致的收发两端出现基函数不一致的情况,对一种新的CASK算法进行了仿真。根据CASK算法和CSK算法以及双极性算法不同干扰、不同噪声和不同收发不一致比例的情况下系统误码率和理论误码率的对比研究,可以发现,虽然在理想情况下,三者差距不大,然而当收发不一致的比例逐渐上升时,CASK算法的传输性能下降较慢,可以进行正常传输,且其传输性能较双极性调制和CSK调制分别提高2 d B和1 d B,具有良好的抗不一致性能,具有良好的应用前景。
